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參數(shù)資料
| 型號(hào)： | CM2021-02TR |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC HDMI TX PORT P/I3 8TSSOP |
| 產(chǎn)品變化通告： | CMD Product Obsolescence 16/Mar/2011 |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | * |
CM202102TR
http://onsemi.com
4
BACKDRIVE PROTECTION
Two scenarios below describe what can happen when
a powered device is connected to an unpowered device via
an HDMI interface, substantiating the need for backdrive
protection for this type of interface.
In a classic scenario, a DVD player is connected to a TV
via an HDMI interface. If the DVD player is switched off
and the TV is left on, there is a possibility of reverse current
flow back into the main power supply rail of the DVD player.
Typically, the DVD’s power supply has some form of bulk
supply capacitance associated with it. Because all CMOS
logic exhibits a very high impedance on the power rail node
when “off,” if there is very little parasitic shunt resistance
and as little as a few milliamps of “backdrive” current
flowing back into the power rail, it is possible over time to
charge that bulk supply capacitance to some intermediate
level. If this level rises above the power-on-reset (POR)
voltage level of some of the integrated circuits in the DVD
player, these devices may not reset properly when the DVD
player is turned back on.
In a more serious scenario, if any SOC devices are
incorporated in the design which have built-in level shifter
and DRC diodes for ESD protection, there is even a higher
risk for damage. In this case, if there is a pullup resistor (such
as with DDC) on the other end of the cable, that resistance
will pull the SOC chips “output” up to a high level. This will
forward bias the upper ESD diode in the DRC and charge the
bulk capacitance in a similar fashion like above. If the
current flow is high enough, even as little as a few milliamps,
it could destroy one of the SOC chip’s internal DRC diodes,
as they are not designed for passing DC.
To avoid either of these situations, the CM2021-02TR is
designed to block backdrive current, guaranteeing no more
than
5 mA on any I/O pin when the I/O pin voltage is greater
than the CM2021-02TR supply voltage.
Figure 1. Backdrive Protection Diagram.
SPECIFICATIONS
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Units
VCC5V, VCCLV
6.0
V
DC Voltage at any Channel Input
6.0
V
Storage Temperature Range
65 to +150
C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 3. STANDARD (RECOMMENDED) OPERATING CONDITIONS
Symbol
Parameter
Min
Typ
Max
Units
5V_SUPPLY Operating Supply Voltage
GND
5
5.5
V
LV_SUPPLY Bias Supply Voltage
1
3.3
5.5
V
Operating Temperature Range
–40
85
C
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